Abstract
Alkyne-functionalized chelate boron compounds with extended π-conjugation on one of the aryl groups attached to boron display thermally reversible and regioselective isomerization on the more delocalized substituent, forming base-stabilized boriranes with an intense color. Linking two of such boron chromophores through a 1,4-phenylene spacer via ethynyl moieties leads to photochemically inert molecules, while connecting them by a nonconjugated silicon bridge yields photochromic systems capable of switching at a single boron center.
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